为探讨饲粮色氨酸水平对蛋鸡生产性能和蛋品质的影响，本试验将720羽300日龄罗曼蛋鸡随机分成5组，每组3个重复，每个重复48羽。对照组饲粮为色氨酸含量为0.16%的玉米-豆粕型基础饲粮，4个试验组饲粮为通过在基础饲粮中添加色氨酸使色氨酸水平分别达到0.20%、0.24%、0.28%和0.32%的饲粮，试验期为49 d。结果表明：0.20%水平组产蛋率最高，较其他试验组及对照组分别提高了2.18%（P<0.05）、3.08%（P<0.05）、3.23%（P<0.05）、3.42%（P<0.05）；各组间平均蛋重、平均日采食量和料蛋比均无显著差异（P>0.05）；0.20%水平组鸡蛋蛋白高度和哈氏单位分别提高了6.69%（P<0.05）、2.20%（P<0.05）；试验组血清尿素氮(SUN)含量显著减少（P<0.05），0.20%水平组血清总蛋白与白蛋白含量显著高于其他各组（P<0.05）；0.20%、0.24%水平组血清中促卵泡素(FSH)含量分别比对照组提高了14.69%（P<0.05）、11.88%（P<0.05），雌二醇(E2)水平提高了20.74%（P<0.05）、15.56%（P<0.05）。结果提示：色氨酸主要通过促性腺激素释放和提高饲料蛋白质利用率等途径提高蛋鸡的生产性能，蛋鸡玉米-豆粕型饲粮色氨酸适宜水平为0.20%。

This experiment was conducted to investigate the effects of dietary tryptophan levels on the production performance and egg quality of laying hens. Seven hundred and twenty 300-day-old ROM laying hens were randomly divided into five groups with three replicates per group and 48 laying hens per replicate. The diet of the control group was a basal corn-soybean meal diet containing 0.16% tryptophan. Through supplementing tryptophan into the basal diet, the tryptophan levels in diets of the experimental groups were 0.20%, 0.24%, 0.28% and 0.32%, respectively. The experiment lasted for 49 days. The results showed that the laying rate in 0.20% group was the highest of all groups and was increased by 2.18% (P<0.05), 3.08% (P<0.05), 3.23% (P<0.05) and 3.42% (P<0.05) compared with other experiment groups and the control group, respectively; there were no significant differences among the groups in average egg weight, average daily feed intake and feed-egg rate (P>0.05); compared with the control group, the albumen height and Haugh unit in 0.20% group were increased by 6.69% (P<0.05) and 2.20% (P<0.05); serum urea nitrogen contents in experiment groups were significantly reduced (P<0.05); serum total protein and albumin contents in 0.20% group were significantly higher than those in other groups (P<0.05); compared with the control group, serum FSH contents in 0.20% and 0.24% groups were increased by 14.69% (P<0.05) and 11.88% (P<0.05), and serum E2 contents were increased by 20.74% (P<0.05) and 15.56% (P<0.05), respectively. The results indicate that tryptophan can promote production performance of laying hens through enhancing gonadotropin release and protein availability, and the optimal tryptophan level in corn-soybean meal diet of laying hen is 0.20%. ［Chinese Journal of Animal Nutrition, 2010，22（5）:1265-1270］